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Piotr Lietra

@piotrlietra

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Senior Data Engineer specializing in regulated healthcare and high-volume data platforms.

Poland

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What I'm looking for

I seek a senior data engineering role building governed, audit-ready data platforms in regulated or high-volume environments with strong cross-functional collaboration and clear processes for data quality and compliance.

I am a results-driven Senior Data Engineer with ten years of experience designing and delivering large-scale, high-quality data platforms in regulated and high-volume environments.

I specialize in building robust data management practices and analysis-ready datasets, implementing structured data review processes and automated validation that improved completeness and reduced reconciliation cycles by over 35% in healthcare projects.

My hands-on technical work spans Python, SQL, PySpark, Azure Data Factory, and Databricks to build governed DataLakes, ETL pipelines, and monitoring dashboards, improving dataset reliability, performance, and auditability for cross-functional stakeholders.

I bring a practical, detail-oriented approach to complex workflows, focusing on data integrity, traceability, and timely delivery to support reporting and regulatory use while driving process improvement and strong governance.

Experience

Work history, roles, and key accomplishments

Current

Senior Data Engineer

Current

BI4ALL

Apr 2023 - Present (2 years 10 months)

Designed and implemented end-to-end clinical-style data management workflows on Microsoft Azure, improving data completeness by 38% and ensuring full audit trail and traceability for regulated datasets.

Azure Data Factory Pyspark Python SQL Data Governance Data Validation

Senior Data Specialist

Data Engineer

Amazon

Jan 2016 - Jun 2020 (4 years 5 months)

Developed robust ETL pipelines and structured data models for transactional and inventory data, reducing downstream reporting discrepancies by 30% and improving query performance by 45%.

Python SQL ETL Data Modeling Performance Optimization Monitoring

Education

Degrees, certifications, and relevant coursework

University of Warsaw

Bachelor's, Data Modeling/Warehousing

2011 - 2015

Completed a Bachelor's program focused on data modeling and warehousing, gaining practical skills in ETL, data modeling, and data integration for large-scale analytics.